Which of the following precautions should be taken when measuring high voltages with a voltmeter?

• A. Ensure the voltmeter and leads are rated for use at the voltages to be measured
• B. Always use standard multimeters
• C. Keep one hand free from contact during measurement
• D. Wear insulated gloves

Answer: (A)

When measuring high voltages with a voltmeter, it's essential to ensure that the voltmeter and its leads are rated for the specific voltages you intend to measure. This precaution is crucial because using equipment that does not meet the required voltage rating can lead to equipment failure, inaccurate readings, or potentially dangerous conditions such as electrical shock or fire. High voltage environments can produce significant hazards, and using rated equipment is part of maintaining a safe operating environment.

While options suggesting using standard multimeters or keeping one hand free during measurement might seem relevant, they do not address the primary concern of equipment compatibility with high voltage levels. Wearing insulated gloves can enhance personal safety by providing an extra layer of protection, but without a properly rated voltmeter and leads, the risk remains high. Therefore, ensuring that your measuring instruments are suitable for the voltage being measured is the best and most critical precaution.